Nozzle for fire extinguishers



Jan. 10, 1961 l. NURKIEWICZ NOZZLE FOR FIRE EXTINGUISHERS Fil'd July 1, .1955

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m E [n f' 10 Wr I ATTORNEY United States Patent O NOZZLE FOR FIRE EXTlNGUISI-IERS Ignatius Nurkiewicz, Colts Neck, NJ., assigner to Stop-Fire, Inc., Brooklyn, N.Y., a corporation of New York Filed July 1, '1955, Ser. No. 519,529

2 Claims. (Cl. 169-1) This invention relates to a nozzle for tire extinguishers of the powder type. Such extinguishers commonly contain powdered bicarbonate of soda and a compressed gas, and are so designed that upon release the compressed gas will expel the powder onto the base of the ame, where the powder evolves carbon dioxide, which smothers the ame.

The success of the use depends on the extent to which the powder is distributed over the flaming area, so that the evolution of the gas may be rapid and thoroly distributed.

The propelling gas is necessarily quite limited in volume, by the s-ize of the extinguisher, and is stored under high pressure. This is quite eiective in expelling the powder, but it does not give the most effective distribution.

It is an object of this invention to utilize to the full the pressure of the compressed gas to expel the powder from the container, and yet, on expulsion, to mix with the issuing jet a further volume of gas to linsure a wider and more uniform distribution.

More specifically, it is an object of this invention to provide a nozzle which will introduce air from the atmosphere and thoroly mingle it with the powder-laden gas before the latter is projected onto the flame.

It is a further object of this invention to change the diameter of the nozzle at the point where the air is introduced, to take care of the larger volume, without unduly restricting the ilow.

The invention is embodied in the construction, one embodiment of which is hereinafter described and shown -in the accompanying drawing, in which Fig. 1 is an elevation of the main operative parts of a tire extinguisher of the type here concerned, with the special nozzle attached; Fig. 2 is a longitudinal section through the nozzle on the line 2-2 of Fig. 3; Fig. 3 is a section on the line 3--3 of Fig. 2.

In the drawings, the numeral is the casing of a re extinguisher adapted to contain the powder and the gas under pressure. A exible tube 11 extends down to the bottom of the container so that as gas issues through the tube, the powder will be entrained and carried with it. The numeral 12 shows conventionally a valve for control of the ow, operated by a handle 13. The exit gas and powder pass outwardly through a hose 14.

In accordance with this invention there is provided a stub tube 15 adapted to be connected to the discharge outlet of the extinguisher. This tube is arranged to discharge into another tube 16 of larger diameter, and at ICC the point where the tubes join, aspirating air inlets 17 are provided, the outlet orifices 18 which face in the direction of movement of the gases, so that the rushing stream of gas will suck in air to be commingled with it.

As here shown the stub tube 15 is threaded at one end, as shown at 19, for attachment to the tire extinguisher outlet, and it terminates atthe other end in a wall 20 through which openings 21 are drilled. The purpose of the wall is to cause the gas -to enter the larger tube 16 in the form of high speed jets.

The wall 20 serves also as the end of the larger tube 16 thereby providing an annular shoulder 22 through which holes 17 are drilled at an angle to the axis of the tube, so that the inrushing jets from orices 21 will suck in air through the opening 17 to mingle with the powder laden gas. The increase in diameter of the tube 16 over the stub tube 15 permits the larger volume of gas to pass out with little loss of kinetic energy, thereby insuring as etective and yet complete coverage of the tire area as possible.

Additional openings 23 may also he provided through the walls of tube 16 to draw in more air if necessary.

With this device the distribution of the re extinguish ing powder has been found to be much more effective than heretofore.

What I claim is:

l. A nozzle for a gas-borne powder tire extinguisher comprising an elongated tubular member having at one end an attachment for connection to a container carrying a fire extinguishing powder under gas pressure, said tubular member being of a length to cause the powder and gas when discharged to be thoroughly mingled, a cylindrical member in alignment with and attached to the opposite end of said tubular member, of larger diameter than said tubular member, to form an expansion chamber, one of said members having a transverse wall at the point where said members are joined, said wall having a plurality of nozzle passages therethrough discharging axially of said cylindrical member whereby the mixture of gas and powder from the tubular member may pass into the cylindrical member in the form of high speed jets collinear with the cylindrical member, said cylindrical member having openings through its outer wall near said transverse wall inclined inwardly and forwardly, whereby the jets will be mixed with outside air substantially at the point of entrance into the expansion chamber, said expansion chamber being of a length to cause thorough mixing of the gas-borne powder with the incoming air.

2. A device in accordance with claim l in which the cylindrical member has other openings through its wall at a point spaced from said first-mentioned openings at substantially the point where jets from said inclined openings converge.

References Cited in the file of this patent UNITED STATES PATENTS 2,492,037 Freeman etal. Dec. 20, 1949 2,555,394 Butler June 5, 1951 2,597,913 Webster Mar. 27, 1952V 2,601,899 Boerner July 1, 1952 2,761,516 Vassilkovsky Sept. 4, 1956 

